Graphical user interface for a display screen or portion thereof



The FIGURE is a front view of a graphical user interface for a display screen or portion thereof showing our new design.

The broken line showing of the display screen or portion thereof is not part of the claimed design.

The Sirius trademark in the bottom left corner of the FIGURE is the property of Sirius XM Radio Inc. The Google trademark in the bottom left side of the FIGURE is the property of Google Inc. The YouTube trademark on the bottom center of the FIGURE is the property of Google Inc. The Flickr trademark on the bottom right of the FIGURE is the property of Yahoo! Inc. Trademarks are the property of their respective owners. 

The ornamental design for a graphical user interface for a display screen or a portion thereof, as shown and described. 